please fill in blanks and answer questions. 13. Chapter 11, Problem A study show

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please fill in blanks and answer questions.

13. Chapter 11, Problem A study showed that a nan shown In a photograph was judged as lett attractive when the photograph showed a visible tattoo compared to the same photograph with the tattoo removed (Resenhoeft, Villa, & Wiseman, 2008). Suppose a similar experiment is conducted as a repeated-measures study. A sample of n - 12 males looks at a set of 30 photographs of women and rabes the attractiveness of each woman photograph appears twice in the set, once with a tattoo and once with the tattoo removed. For each participant, the using a S-point scale (S - most positive). one her records the difference between the two ratings of the sane photograph on average, the photograph without the tattoo is rated M- 1.2 points higher than the photograph with the tattoo, with SS 33 for the difference scores. Does the presence of a visible tattoo have a significant effect on the attractiveness ratings? Usea two-tailed test with -.05. (Use three decimal places for the critical values, two for the others.) t Distribution -3.0 -2.0 1.0 D.0 1.0 2.0 3.0 Variance Estimated Standard Error t Statistic Critical Values O Fail to reject the null hypothesis; there is no significant difference O Reject the null hypothesis; there is no significant difference. o Reject the nuli hypothesis, there issignificant difference O Fail to rejedt the null hypothesis; there is a significant difference

Explanation / Answer

here variance =SS/(n-1) =33/11 =3

estimated std error =(variance/n)1/2 =(3/12)1/2 =0.5

test statistic =M/std error =1.2/0.5=2.4

for 0.05 level and (n-1=11) degree of freedeom crtiical value =-/+ 2.201

as test statistic is higher then critical value ;

reject the null hypothesis ; there is significant difference

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